Devin M. answered • 04/16/20

B.S. in Mathematics with 5+ Years of Tutoring Experience

Vertical angles are congruent, so you can set Angle A = Angle C and solve for x.

Angle A = Angle C

4x+12 = x+18 Get x terms on L side of = & constants (plain #) on R side by subtracting x on both sides.

__-x -x__

3x+12= 18 Now, subtract 12 from both sides of equation to get constants on R side of equation.

__ -12= -12__

__3x__ = __6__ Now, divide by 3 to solve for x.

3 3

x = 2